Device for transmitting motion from alpha rectilinearly reciprocating member to alpha rotatable member



l June 30, 1931.

o. G. WELLTQN MSHA@ DEVICE FOR TRANSMITTING MOTION FROM A RECTRECIPROCATING MEMBER TO A ROTATABLE M Filed Feb. 1927 TLINEARLY EMBER 5Sheets-Sheet l June 30, 1931 o. G. wELLToN DEVICE FOR TRANSMITTINGMOTION FROM A RECTILINEARLY RECIPROGATNG MEMBER TO A ROTATABLE MEMBERFiled Feb 2 1927 Jun@ 50, 1931. QG. WELLTN SZG DEVICE FOR TRNSMITTINGMOTION FROM A RECTILINEARLY l RECIPROCATING MEMBER ToA A ROTATABLEMEMBER Filed Feb'. 2, 1927 3 Sheets-Sheet 3 CII Patented .une 30, 1931UNITED sfrarrs FTNVF FFC yOTTO GOTTFRIED WELLTON, OF TROLLHATTAN, SWEDENDEVICE FOR TRANSMITT'ING MOTION FROM A REGTILINEARLY RECIPROCATINGMEMBER TO A ROTA'IABLE MEMBER Application filed February 2, 1927, SerialNo. 165,254, and in Sweden February 18, 1926.

The present invention relates to a device for transmitting motion from arectilinearly reciprocating member to a rotatable member in such mannerthat the rotatable member is entrained upon movement of thereciprocating member in the one direction, but n ot upon movement of thesame in the opposite direction. The present device is intended toreplace the ratchet feeding devices heretofore employed for thispurpose, and the invention has for its object to remove the diflicultiesinherent in such prior devices, viz.v that a quite considerable lostmotion often arises between the two members when the reciprocatingmember changes its direction of movement, and that during operation saidymembers produce `a clicking sound which in certain cases may have avery disturbing effect. The invention consists principally in that twoscrew gea-rings are interposed between the reciprocating member and therotatable member, one'of said gearings being self-stopping and the othernot being self-stopping, in. such manner' that upon movement of thereciprocating member inthe one direction the self-stopping screw gearingacts as an ordinary toothed or spur gearing and. entrains the rotatablemember, the other screw gearing which is not self-stopping, serving uponmovement of the reciprocating member in the opposite direction to rotatethe screw of the self-stopping screw gearing back to a new position ofengagement with the screw wheel of such gearing. By this arrangement amotion transmitting device is obtained which operates without noise andwith practically ,no lost motion.

In this specification the term screw gearing should be interpreted asincluding all types of such gearing consisting of two cooperatingscrews, whether convex or concave. Both of said screws may thusbeprovided with exterior threads, andv one of the f.- same may, for'instance, be a worm wheel, or

one of the screws may have interior threads, and be, for instance, anut.

in the accompanying drawings a few different embodiments of theinvention are illustrated by way of example. Fig, l shows a motiontransmitting device according to the invention in longitudinal section,and Fig. 2 shows the same viewed from above. Fig. 3 shows the samedevice as in Fig. l, but with the various parts in other mutual 5positions. 4L shows a motion transmitting device according to theinvention having two screw gearings the screws of which are connected toone another by means ofy a gearing, and Fig. 5 shows a modifiedconstructional form of this device. Fig. 6 shows a double motiontransmitting device according to the invention. Fig. 7 shows a modifiedconstruction of the device illustrated in Figs. l and 2.

In the construction illustrated in Figs. l to 3, l denotes therectilinearly reciprocating member which in this case has the shape of asleeve which is slidable but not rotatable on a rod 2 the ends of whichare secured in 7o a frame 3, and which sleeve may be put in areciprocating motion by means of a link rod 8l, 8l, which rod engages aneye' 4 on said sleeve. Rotatable but not slidable on said sleeve l aretwo worms 5 and 6 which 7 are rigidly secured to one another, and eachof which meshes with a worm wheel 7 and 8, respectively. The first-namedof said worm wheelsis keyed to a shaft 9 which is journalled in fixedbearings 82, and which in this case is assumed to be the rotatablemember to be rotated upon movement of the sleeve l in the one directionbut not upon movement of said sleeve in the opposite direction. To theshaft 9 a chain sprocket wheel 10 is also secured which is connected bymeans of a chain ll with a chain sprocket wheel 12 of the same shapemounted on a shaft 13 parallel to the shaft 9 and likewise journalled iniXed bearings 83 and on which shaft 13 the worm wheel 8 is mounted, sothat said two shafts 9 and 13 are always caused to rotate in the samedirection and with the samev speed. The worm wheel 8, however, is notsecured to the shaft 13 but is mounted on a connecting sleeve 14 slidandthe worm wheel' 7i As. wllbe f evident fromA the above. description andfrom the drawings there are interposed between. the rectilinearlyreciprocating-,member 1` andi the rotatable member 9 which. isto berotatedY upon movement. ofthe member 1in the onedirectiombut not. npon.

movement of the. same: in the. opposite direc-y tion, t'wo wormgearings5., 7 and 6, 8. Ac-

cording to'hthe inventionthefirst-named one-y 5=,. 7 ofthese two wormvgearngs is self.-

stopping, while. the other 6, 8: is not. selfstopping; In. the-jpresentinstance wherev bothfworms 5l and. 6 and. also. both. worm wheels-7andlv 8Y have. the. same; size and.. lead,4 the. said difference may beattained byf mak- I ing thex parts ofthe gearings of different ma.-

Y terials. For'instance, the worm. 5A andthe.

worml wheel7l may,.both be. made of'. steel, whilev in they othergearing.4 the wormv 6V is.

made of steel but the worm. wheely 8 is made 'of bronze. In this mannerairconsiderabl'y smaller coefficient offrictionis. obtained be.-

tlween the parts 6 andf 8" than. betweenrthe parts 5 andk 7 ,.andrbysuitablezselection. ofV the. leadY in! relation. to' the said.coefficientsv of friction itis therefore possiblerto attainthat.

the worm. gearing `5,7y becomes. self.stopping,.

but the gearing 6,8. not self-stopping.

Y The 'described deviceoperates in the. fol? lowing. manner: In. thepositionf'of. the va.-

rious parts shownV in. Fig. 1 the'worm:wheelv 8T is adj usted-bysuitable adj ustme'nt. ofiV the connecting.` sleeve. llin relation. tothe, wormwheel17 in( such manner that,.when.the teeth of the worm wheel8. occupying posi# tion of. engagement mesh loosely with the thread-softhe screw 6.,.that i'sto say,.witl1out.v contacting under. pressureon; either side, the

Vteeth ofthe worm. wheel1 7f occupying, posi-A f Y tion. of'engagement.bear at thevrghtfhand;

side. of Fig,Y 1 with. ai certain pressure against. thecorresponding/threads ofthe worm 5,` as` shown at exaggerated scale inFig. 1 for the sake -ofclearness Now, if the. sleeve 1` is moved', forinstance, towards the left in-F-ig.

1, the worm gearing 5, 7 which is selfstopping in the vmanner abovedescribed, will operate as an ordinary toothed gearing, so

Ythat the worm wheel 7 and theshaft 9 are The shaft 9 may be assumed tobe prevented from: rotating :in the ldirection opposite to the arrow17in Fig. 1 by any suitable means,

for instance as illustrated in Fig. 2, by a seeondzset of worm gearings5, 7 and 6 8 similar to the gearings 5, 7 Y and 6,78 abovedeserbetdg.andinterposed between the'shafts 9;.13 andi al. reciprocatingmember 1 similar to the member 1, and which is Yreciprocated by the--linl rodi 81" in such Vmanner that when one Yof said reciprocatingmembers. 1 or performs a forwardjstrokdthe other performs a back`stroke. When afterwards the sleeve'rl"v reverses itsv movement andbegins to move' towards' the right in Fig. 1, the teeth of the wormwheelk 8then in mesh come to bear Ywith their lelt-handV surfacesagainst corresponding. threads of the worm 62 Since also the wormwheel 8is prevented by thechain 11 fromtrotating in the'counter-vclockwise'direction' in Fig. 1, however, and, since on' the other handthe worm gearing;

6, 8 is not self-stopping, u pon movement of the sleeve 1towards'the'rightin'Fig; 1 the' said engagementbetween the'now'stationary,

worxrrwheel 8 and the worm 6 which srotatable on the sleeve f 1, willresult in the two worms 6 and 5 being caused to rotate on the sleeve. 1in such direction, that the worm lis'. screwed back to 'a new positionof engagement with the worm wheel; 7, so that when the sleeve 1 againreaches its'po'sition farthest to the right, the various parts againoccupy the Vpositions illustratedv in Fig. 1, with .the lexception thatthe two vworm wheels 7 and8 have been rotatedthrough acertain anglewhich is'proportional to the stroke ofthesleeve 1'. The course describedmay 'therefore' be repeated when next the sleeve 1 begins to move.towards the left;

With the adjustment ofthe two worm wheels 7 and 8relatively-to eachother as shown in Figfl, the shaft 9 will thus always' be rotated in thedirection indicated by the arrow 17. f

If, on'l the' other hand, it is desired'to cause. theshaft 9 to rotateinthe opposite direc tion,that is to say, toV be rotated when the sleeve1 ismoved towards the. right, the

worm wheel 8 is adjusted, by means of theV connectingA sleeve lll,relatively to .the worm wheel 7 inthe manner. illustrated in Fig. 3,thatis to say,.in. such mann-er that when 'the teeth ofthe worm` wheelSoccupying posi.- tions ofengagement meshA loosely with the threads ofthe worm 6 without bearingwith shaft 9 are rotated in the direction ofthe` arrow 18 in Fig. 3, that is to say, in the opposite direction tothat in Fig. 1, and in such rotation the worm wheel 8 is also ontrained,so that the teeth of said worm wheel retain'their loose mesh with thethreads of the worm 6. Then afterwards the sleevel 1 reverses itsmovement and begins to mov towards the left in Fig. 3, the teeth of theworm wheel 8 then in mesh will come to bear with their right-hand facesin Fig. 3 against corresponding threads of the worm 6, and since theworm wheel 8 is preventel by the chain 11 from rotating in the cloclewise direction, and since the worm gearing 6, 8 is not self-stopping,upon movement of the sleeve 1 towards the left in Fig. 3 the two worms 6vand 5 will be caused to roti on the sleeve 1in the direction indicatedby the arrow 19, so that in this manner the worm 5 is screwed back to anew position of engagement with the worm wheel 7, and upon the nextmovement of the sleeve 1 towards the right it can again rotate the wormwheel Y7 in the direction of the arrow 18. lVit-h the adjustment of thetwo .rorin wheels 7 and 8 relativelyto one another as shown in Fig. 3,the shaft 9 will thus always be rotated in the direction indicated bythe arrow 18.

In the construction according to Figs.

' suitable, however, to give the worm of the non-self-stopping gearing alarger angle of helix thanv the worm of the self-stopping gearing.Figure 7 illustrates this modiiication of the device shown in Figs. 1and 2. Since the lead or the pitch must be the same for both worms inorder that the correct engagement shall be retained between the wormwheel 108 and the worm 106 when the gearing 105, 107 operates as atoothec gearing and rotates theshaft 109, it is necessaryysimultaneously to make the worm 106of a less diameter than the worm 105,

and thus also to lower the shaft 113, that is to say, to place saidshaft correspondingly closer to the common axis of the worms 106 andthan the shaft 109, which does not of course present any diiiiculties.By such modification of the device the required difference in respect ofself-stopping action may be attained even if both worm wheels 107 and108 be made of the same material, but it is of course more advantageousstill to retain the above described construction of the worm wheels ofdifferent materials, so that both a less coefiicient of friction and alarger angle of helix is obtained of the worm 106 of thenon-self-stopping gearing than of the worm of the self-stopping gearmg.

In the embodiment above described the two screws 5 and 0 are rigidlysecured to one another and will therefore always rotate with the samespeed when the member 1 returns without rotating the shaft 9. A greatdifference in respect of self-stopping action between the two screwgear-ings and thus also a very reliable operation may be attained,however, by making the screws sparate and interposing between the same agearing in such manner that the screw of the non-self-stopping gearingwill rotate with. less speed than the screw of the self-stoppinggearing. he iirst-named screw nay then also without diiiiculty be madewith a many times larger angle of helix than the latter. Two embodimentsof this type are illustrated in Figs. d and 5.

1n the construction illustrated in Fig. l, 20, 21 denote therectilinearly reciprocating member which in this case consists of vtworings which are rigidly connected to one another, for instance by meansof pair of arms 85, and which are slidable on squarethreaded screw 28 insuch a manner that they may be moved forwards and back in thelongitudinal direction of the screw, for instance by means of a link rod86 engaging the eye 2li. The' square-threaded screv 28 which in respectof operation corresponds to the worm wheel 8 in Fig. 1, rotatab A, butnot slidably mounted in suitable bearings 87. Between the rings 20 and21 thc are interposed two screw-threaded sleeves La and 20, one outsidethe other, the outer sleeve 25 boing provided with exterior threads bymeans of which it engages a worm wheel 27 which corresponds to vthe wormwheel 7 in Fig. 1, and the inner sleeve 26 being provided with interi( rthreads by means of which it engages the threads of the screw 28. Theworm wheel 27 is secured to a shaft 29 which forms the rotatable memberwhich is to be rotated upon movement. of the rings 20 and 21 in the onedirection, but not upon movement of the same in the opposite direction.The shaft 29 is connected by means of some suitable gearing, forintransmission 90,91, 92, tothe screw 28 in.

Ai o

stance a bevel gearing 88, 89V anda chain such manner that said screwalwaystalres part in the rotation of theV shaft 29. Be-

tween the sleeves 25and 28 t sleeve 26 is rotated around the axis of thescrew 28, the bevel gears 8O will thus roll against the row of vteeth 32on the non-ro tatable ring 20, and will thereby rotate the outer sleeve25with a--speed which is twice.

the yrotational speed of the sleeve 26. lso in this case there shouldbeV interposed in the above-mentioned gearing between the shaft 29 andthe screw 28, for instance between the shaft 29 and the Wheel 88 oit thebevel gearing, an adjustment device, for instance a slidable connectingsleeve 93 having oblique ridges of a lrindsimilar to .that shown in Fig.1, so that by means ofthesame it is possible to rotate the screw 28slightly in relation tothe worm wheel 27 for the purposeof changing thedirection of rotation of the shaft 29.Y

As will beV understood romthe aboveV description, between therectilinearlyreciprocating member 20, 21 and the rotatable inember 29there are also in this case interposed tvo screw gearings 25, 27 and 26,28, the first named ot which is made self-stopping,

according to the invention, whereas the .lat-l ter is not'self-stonDino'.

In the position or" the dierent parts ilV gagement bear atthe'right-hand side in Fig. Y

4 with a certain pressure against the corresponding threads o'f the wormor screw 25. Now., if the rings 20, 21 are moved towards tie leit inFig. l the self-stoppingA worm gearing 25, 27 will act as van *ordinarytoothedlgearing, so that the worm wheel 27 and the 29 are rotated in thedirection' of thearrow 3i in Fig. 2l. Owing to the above mentionedgearing the screw 28 is also entrained during such rotation, so that itsthreads retain their loose mesh with the threads of ltlie screw 26,while the two screws 25 and 26 are moved with the rings 20 and 21without rotating. When afterwards the nere is also in terpos'edagearingwhich in the instance il#` rings 20 and 21 reverse their direction4 ofmovement and begin toV move-.towardslthe right in Fig. 4, owing tothenon-sel-stopping engagement between the screwy 26 and the screw 28 saidscrewk 26 is put'.-

in rotation in such direction and' with such rate of speed that it can.moveVr with the rings 20, 21. Such rotation of the screwv 2 6Y isltransmitted through the;

bevel gears 30 to the worm or screw 25, so that said screw isscrewedback inA the' same manner as the worm 5 in Fig. 1,'.t0 va new positionoi' engagement with the worinv wheel right in Fig. 4, the screw 28 isadjusted', by ff means .of the adjustment device' 93 -interposed inthegearing. between the vmembers 28 and 29, relatively tothe worm- .wheel27 in such manner that, at a loose; engagement betweentlie screws 28 and26, the teeth. of` the worm wheel 27 occupying positions of engagementwill instead bear with their lethand faces in Fig,- 4 againstcorresponding. threads ot the screw or worm 25 with a cer tain pressure.The selfstopping worin' gearing 25, 27 will then operate as an ordiria-ry toothed gearing and rotate the worm. wheel'27 and' theshaft V29in the counterclockwise direction in Fig. 4 upon movement.

of thefrings 20, 21towarols' the right, while upon movement of the ringstowards the left the screw or worm 25 isfscrewed back inthe mannerVabove described to a new posi.-

tion of engagement with the then stationary worin wheel27. 's y Inthejconstructionr accordingv to Fig; 4 the gearing between the screws 26and 25` the 4former of which is placed inside the latter in order tosavev space, is such that `the seli'fstopping screw 25 is rotated with aspeed vwhich is twice as high Las the rotationalV speed or the screw26.If desired, however, it is' possible to obtain a still. greaterdifference in the speed of rotation be.- tween the two screws bylocating the noir self-stoppingscrew outside the self-stopping screw andconnecting the same by means. of an ordinary cylindrical gearing whichin such case may be constructed for any desi-red gear ration. Anarrangement of this type, representing the most general case, is showninFig.5. l Y

Accord'ngto Fig. 5V the r'ectilinearly reciprocating member consistsy ofa cross piece 35 and two' rings and SZrigidly connect-V to the wormwheel 8 in Fig. l, is rotatably but not siidably journalled in fixedbearings ed with said crosspiece-by means of arms 95, 96 or the like.Said cross piece together Lcross piece be moved forwards and kback thelongitudinal direction of the bar, for instance by means of a link rod119 engaging the eye 40. The screw 39, which corresponds yto thescrew'28 in Fig. 4 and '41. Between the cross piece 35 and the ring36fthere is interposed a sleeve 42 rotatable and slidable on the bar 38and screw-threaded on its outside, so` that it forms a worm the threadsof which engage a worm wheel 43 which corresponds to the worm Wheel 27in Fig. 4,*and between the cross piece and the ring 37 a sleeve 44 ismounted on the screw 39, said sleeve being screw-thr'eaded on its insideand engaging by means of such screw-threads the screw-threads of thescrew 39.k .The worm wheel 43 is secured to a shaft which forms therotatable member which f is to be rotated upon movement of the crosspiece 35.in the one direction, but not upon this case beinterposed anadjustment device, for instance a slidable sleeve 100 having .obliqueridges of a kind similar to that shown in Fig. 1 and inserted betweenthe s shaft 45 and the gear 97, by means of which itis possible slightlyto rotate the screw 39 relatively to the worm wheel 43 for the purposeof `changing the direction of rotation of the shaft 45. Finally, betweenthe sleeves 42 and 44 there is also interposed a gearin Awhich in thiscase consists of a small gear 4 which is made integral with the sleeve42 and which meshes with a larger gear 48 which is made integral withthe sleeve 44.y The ratio between the speeds of rotation of the screws42y and 44 will thus in this case be dependent upon the ratio betweenthe diameters of the two gears 47 and 48, which latter ratio may in thiscase be chosen as desired; The operation of this device is substantiallythe same as that above described in rconnection with Fig. 4. Also in thedevice according to Fig. 5 there are interposed between thereciprocating member 35, 36, 37 and theV rotatable member 45 Vtwo screwgearings 42, 43 and 44, 39, the former of which is self-stopping but thelatter of Vwhich is not self-stopping.y :In the'positiony of the partsillustrated in Fig. 5, the worm wheel 43 adjusted in relation to thescrew 39 in such manner that the self-stopping worm gearing 42, 43 actsas an ordinary toothed gearing and rotates the worm wheel 43 and theshaft 45 in the direction indicated by the arrow 49 when the cross piece35 is moved towards the left, whereas upon movement of said cross piecetowards the right the worm 42 is screwed back by the agency of the screw44 and the gears 48 and 47 to a new position of engagement with the Wormwheel 43, so that upon the next movement of the cross piece 35 towardsthe left said worm can again rotate the worm wheel 43 in the directionof the arrow 49. Again, if it is desired to cause the shaft 45 to rotatein the opposite direction, the worm wheel 43 is adjusted relatively tothe screw 39 in such manner' that the teeth of the worm wheel occupyingpositions of engagement bear with their left-hand faces in Fig. 5against the corresponding threads of the worm 42 with a certainpressure, so that the self-stopping worm gearing 42, 43 acts as anordinary toothed gearing and rotates the shaft 45 when the cross piece35 is moved i towards the right in Fig. 5.

Finally, in Fig. 6 a double motion transmitting device is illustratedthe construction of which most nearly resembles the one illustrated inFig. 4, with the difference however, that there is no gearing betweenthe two worms or screws. According to Fig. 6 the rectilinearlyreciprocating member consists of a trough-shaped slide 50 the planelower surface of which is adapted to slide cn a plane surface of theframe 51, and which may be reciprocated by means of a link rod 120,engaging the eye 52. A square-threaded screw 56 extends throughapertures in the two end walls 53, 54 of the slide and in a partition 55provided intermediate said end walls, said screw being provided withlefthand threads on the one half of its length and with right-handthreads on the other half, and the ends of said screw being ro tatablybut not slidably journalled in the frame 51 by means of ball bearings 57and 58. In the spaces between the two end walls and the partition of theslide sleeves 59 and 60 are mounted on the screw 56,` said sleeves beingprovided with interior as well as exterior threads land engaging bymeans of such interior threads the corresponding right-hand andleft-hand threads of the screw 56, while their exterior threads, whichare right-hand threads on the one sleeve and left-hand threads on theother, each engage one Worm wheel 61 and 62, respectively. Said wormwheels are secured to two parallel shafts 63 and 64, respectively, whichform the rotatable members which are to bc rotated upon movement of theslide 50. yThe two shafts 63 and 64 are interconnected by means of ears121, 122, in such manner that they are orced to move in oppositedirecable gearing vslightly ielat y Y y and `62 'for the purpose ofVreversing the Vrection'of rotation of the shafts 63 and-T641.

f'tions, as indicated the yarrows shownrfin Fig. 6. One of said shafts,for instance 64, is 'further connected byznieans o-some suitn tsuch as atrain of gears 123, 124, 125, with av gear 65 which islormed as a nutscrewed on to one end oit thescrew 56, and which may be screwed more'orless on ito said screw by turning a lever .66`which ac .tuates a cap67 screwethreaded intoY the frame 51 andenclosing the ball bearing :58,

[jandby the turning kof which said ball bear- Y ing land thus Valso thegear wheel 65 maybe Imoved slightly towards the ri lit or towardsv theleft in Fig. 6. Said cap 6 iorfmsiii this case theV adjustment, deviceby means of slidetowards the right'in FLg.l 6.

which it is possible to rotate the'vscrew '56 ively to the worm wheels61lBetween the reciprocating member 50 and each of the rotatable members63 "and 64 lthere are thus also Vin this case interposed rtwo screwAgearings, namely between the Vmembers V50 and '63 the screw. gearingsv59,

61 and 59, 56 the lformer of which is seltstopping but thelatte'r notself-stopping, and between the members 50 and 64the"screw 'gearings60,62 and 60, 56 tlie'former of which isselfv-stopping but the'latter ofwhich l is not self-stopping. Inthepositiont of` the various partsillustrated in Fig. 6 the worm wheel 61 is adjusted relatively tothescrew` f 56 in such manner that when the slide 50 Yis moved towardsthe right in Fig. 6, Vtlie'selstopping screw gearingv 59, 61 acts'as Janordinary toothed gearing and rotates the worin wheel 61' and the shaftV63 inthe above-meiitioned toothed'Y gearing '121,' 122 betweenthezshafts 63 and 6Ltlie'flatter shaft as well as the worm.wheelf62are'siniultween'ysthe shaft64 and the' gear 65 and the screw'56 vthis latter and also the4 sleeve""60 Upon movement of the ,slide'Otowards the right the screw ,56' and sleeve 60ans thus rotated, whereasthe sleeve 59 does not rotate.

When afterwards the' slide 50 is n coinedzto-V wards the left theself-stopping worm gearingy 60, 62 acts as an `ordinary vtoothed gear#ingand rotates the worm' wheel l62 Vand the 'shaft 64 inthe clockwisedirection," that is to-sav, in thesame direction as that'in whichv .theshaft 611 was Just'rotated by tlie'shatt` 63.v`v vSiinultaneously Ythelshaft 63, screw '56,

and'sleeve 59 areiotated, so thatthe exterior I' threads on the latterare turned to ja' new po.

sitioii ofeng'agement with the worm wheel 61. Upon movementoft'he slide50 towards ther'lerftft'he screwf5'6 vand the sleeve 59 lare arrows,tlie'screw 56 is adjusted byimeans of `tliejlever66 relatively totheworm wheels ,thus rotated, "whereas the' sleeve'() ldoes not 61 and 62`in `such manner that the self- 4stopping worin gearing 59,61 acts as anorydirectionwhentheslide 50 iss-moved towards the lett in yFig..6,whereas the self-stopping worm gearing 60, 62 acts as atoothed gear- Qingand rotates the shaft 64 in the counterclockwise vdirection uponmovement of the The embodiments yabove described 'and illustrated in thedrawings are only to be regarded as examples and may obviously befurther modied in respecty of `their details inV several diderent ways'without Ydeparting trom the principle ofthe invention. "I claim: Y

`1. 'In `a Ymotion `transinitting device the (combination of areciprocating member, Aka "rotatable membeig .a self-stop ing; screwlgearing interposed between sai :reciprocating member and said rotatablemember rand acting npon movement .ot said reciprocating member in theonedirect-ion as an ordinary f toothed geariiigfto-rotatesaid-rotatablemem- `be; i,'-sa-i 'i self-'stopping screw Agearingcomprising Ia `vscrew wheel connected to said' rotatable `member, andascrewy Vcooperating with saidl Vscrew wheel'and connected toIsaidreciprocating member, la guide guiding said screw yto move in 'arectilinear 'path counter-clockwise direction. (Dwing to the d "ingAalso interposed between said 'reciprocate tangential to said screwwheel,%and"a1;gear

"member `and said rotatable member and e Vmilf/5411512 uplrniovement Vofsaidreciprocating l taneously rotated in the clockwise direction," landowing to the gearing '123, 1221', 125 be' "membergin the opposite'direction to `rotate said screwotf'sa'id sel-stoppingjscrew gearbacktola Anew position of engagement iwithsaid screwfwheel of such gearing;

K 2; 'In a jmotion :transmitting device the combination of la*reciprocating member, a

rotatable member, a self-stoppingscrew gearing ,interposed between saidreciprocating member -and Asaid lrotatable member and acting uponmovement of saidreciprocating fineinberin the one diiection'as an`ordinary 'toothed' gearing to rotate said `rotatable member, saidself-stopping screw gearing l `.coinprisin g a yscrewfwlieel connectedto said rotatable member, and `axscrew cooperating uwith saidscrewwheeland connectedy to said `jreciprocating member, and .anonsel'-stopping screw gearingY also interposed be- ',tween' sa'id'rreciproeating member and Asaid rotatable member and acting-up onmovement otsaid reciprocatingl member `inthe-opposite direction :torotate ,said screw .of v'said seit# stopping screw gearing Fback to anewposition of engagement with said screw 'Wheel dinarytoothed gearing androtatesthe Iworm `wheel 61v and the shaft 63 in the clockwise of saidself-stopping gearing, said non-self stopping screw gearing comprisingone screw memberl connected to said rotatable member so as to be rotatedby the same, and a second screw member cooperating with said firstnamedscrew member and connected to said screw of said self-stopping screwgearing, and at least one guide guiding said screw of said selfstoppingscrew gearing to move in a rectilinear' path tangential to said screwwheel of said gearing and said second. screw member of saidnOn-selt-stopping screw gearing to move in a rectilinear path parallelto the path of movement ot said screw of said self-stopping screwgearing.

3. In a motion transmitting device the combination oi' a reciprocatingmember, a

Arotatable member, a self-stopping screw gearing interposed between saidreciprocating member and said rotatable member and acting vupon movementof said reciprocating member in the one direction as an ordinary toothedgearing to Vrotate said rotatable member, said self-stopping screwgearing vcomprising a screw wheel connected to said rotatable member,and a screw cooperating with said screw wheel and connected to saidreciprocating member, a non-sel'f-stopping screw gearing also interposedbetween said. reciprocating member and said rotatable member and actingupon movement of said reciprocating member in the opposite direction torotate said screw of said. self-stopping screw gearing back to a newposition ot' engagement with said screw wheel of said self-stoppinggearing, said nonselfstopping screw gearing comprising one screw memberconnected to said rotatable member so as to be rotated by the same, anda second screw member cooperating with said first-named screw memberand-connected to said screw of 'said self-stopping screw gearing, laguide guiding said'reciprocating member to move in a rectilinear pathtangential to said screw wheel of said selistopping screw gearing, saidscrew of said self-supporting screw gearing and said second screw memberof said non-self-stopping screw gearing being screw gearing alsointerposed between said reciprocating member and said rotatable memberand acting upon movement of said reciprocating member in the oppositedirection to rotate said screw oi said self-stopping screw gearing baclrto a new position of engagementwith said screw wheel of saidself-stopping gearing, said non-selfstopping screw gearing comprisingone screw member connected to said rotatable member so as to be rotatedby the same, and a second screw member cooperating with said lirst-namedscrew member and connected to said screw of said self-stop ping screwgearing, a guido guiding said reciprocating member to move in arectilinear path tangential to said screw wheel of said selfstoppingscrew gearing, said screw of said self-stopping screw gearing and saidsecond screw member of said nonnself-stopping screw gearing beinginterconnected so as to rotate with a definite relative speed and beingrotatably journalled in said reciprocatinO member on an axis parallel tothe path et movementot said reciprocating member.

5. In a motion transr itting device the combination ci' a reciprocatingmember, a rotatable member, a sellstopping screw gearing interposedbetween said reciprocating member and said rotatable member and actingupon movement or :iid reciprocating member in the one direction as anordinary toothed gearing to rotate said rotatable member, saidself-stopping gearing' comprising a screw 'wheel connected to saidrotatable member, and a screw cooperating with said screw wheel andconnected to said reciprocating member, a non-seli-stopping screwgearing also inteiiosed between said reciprocating member and saidrotatable member and acting upon movement et' said reciprocating memberin the opposite d rection to rotate said .crew of said seit-stoppingscrew gearing baclr te a new 'position or" 'engagement with said screwwheel et said self-stopping gearing, said ne;i-seiitstoppii1g screwgearing comprising one screw member connected to said rotatable memberso as to be rotated by the same, and a second screw member cooperatingwith said iii'st-named screw member and connected to said screw of saidself-stopping screw gearing, at least one guide guiding said ot saidseltstopping screw gearing 'to more in a rectilinear path tangential tosaid screw wheel of said gearing and said second screw member orp saidnon-sel-stopping screw gearing to move in a rectilinear path parallel totbe path of movement ot said screw oi" said seit stopping screw gearing,and an adjustment device interposed between the members of said twoscrew gear-ings connected to sain. rotatable member for rotating saidnicmbers relatively to each other for the purpose of changing thedirection of rotation cit said rotatable member.

ilit) comprising a screw wheel connected` to said rotatableV member, anda screw vcooperating with said screw wheel and connected to saidkreciprocating member, and a non-sel -stopping screw'gearingalsointerposed between said reciprocatii'igfmember and said rotatablemember and acting upon movement of said reciprocating member in thelopposite direction to rot-ate said screw oisaid seit stopping screwgearing .back to a new position of engagement with said screw wheel ofsaid self-stopping gearing, said non-selfstopping screw 'gearingcomprising one screw member connected to said rotatable member so as-tobe rotated by the same, and a second screw member cooperating `with saidfirst-named screw member and connected yto said screw ot'saidselffstopping vscrew gearing, and at least one guide 'g'uid-j .ing saidscrew ot said self-stopping screw gearing to move in a. rectilinear'path tangential to said screwwheel of said gearing and said secondscrewmember of said nonsel-stopping screw gearing to move ina rectilinearpath Vparallel to the path ci movement of said screw of saidselfstopping screw gearing, the screw members of the non-self-stoppingscrew gearing having a larger angle of lead than the members of theself-stopping screw gearing and theisccfond screw member Votl thenon-sel-stopping Vscrew 'ear-inoy havino'a less diameter than 2D l t3the .screw ofthe sel-'stoppingscrew gearing.

7. In .a motionV transmitting device the' combination of a reciprocatingmember, a

rotatable member, aV self-stopping screw gearing interposed between*said recipro- Yeating' member and said rotatable member and acting uponmovement of said reciprocating member inthe one direction asV anordinary toothed gearing to rotatek said ro tatable member, saidself-stopping screw gearing comprising a screw wheel connected rtosaidrotatable member, and a screw cooperating with said screw wheel and'c on- Y iiected to said reciprocating member, a nonself-'stopping screwgearing also interposed between said reciprocating member land-saidrotatable member and acting upon movement of said reciprocating memberin the opposite direction to rotate said screw of said self-stoppingscrewA gearing back to 'af new position oi' engagement with' said screwwheel oi* said self-stoppinggearing, said nonself-stopping screw gearingcomprising one,

said tiret-named screw member 'and connectedito said screw of saidseltestoppingscrew gearing, and at .least one guideguiding said screw ofsaid self-'stoppingscrew gearing to move in a rectilinearpath tangentialto sait screw wheel of said gearing and said second screw member of saidnon-sel't-stopping screw gearing'to move ina rectilinear path parallelto the path of movement of' said screw ot said self-stopping screwgearing, said tiret-named screw kmember of said non-seli stopping screwgearing consistingoi a screw located transversely to said rotatableniember and geared tothe same.' v l 8. In a motion'transmitting devicethe combination of a reciprocating member, a rotatable member, alself-,stopping screw gearing interposed between said reciprocatingmember and said rotatable member and acting .upon movement of saidreciprocating member in the one direct-ion as anordinary toothed gearingto rotate said rotatable member, said self-stopping screw gearingkcoi/uprising a screw wheel connected to said rotatable member, and ascrew cooperating with said; `screw Wheel andsconnected to saidreciprocating member, a non-self-stopping screw gearingalso interposedbetween said reciprocating member and said rotatyable'member and 4actingupon movementoi said reciprocating member in the V `op- .direction Vtorotate said vscrew of ,said vself-,stoppingv screw gearingback to a newposition of. engagement vwith said screwl Wheel of said.v self-stoppinggearing, said non-sel-,stopping screw gearing comprising .one screwvmember connectedto saidrotatable member ySoas to be rotated by thesame, and a second .screwr member cooperating with saidfirst-named screwmember and connected to said screw of said self-stoppingxscrew gearing,vat least one guide iguiding said screw of saidv seli- 'stopping screw,gearingl to move in a rectilinearpath tangential toy said `screw wheelot 'said Vgearing and said second-screw member of said non-seltstoppingScrew v gearing to move in a rectilinear path parallelfto thev path'ofmovement of said screw of said selfstopping screw gearing, saidfirst-named screw member of said non-seli'stopping screw gearingconsistingof a lscrew' located transversely to saidV rotatable memberand geared to the same, said second `screw meinberof saidnon-sel-stopping screw gearing consisting of interior screw threads on asleeve threadedbnto said screw, andv said screw' of said self-stoppingscrew gearing consisting of vscrewthreads fon/the Aoutside of saidsleeve. a y f 9. In a motion transmitting device the combination of aVrota-table device compris;`

ing two shafts, a gearing connecting said shafts to rotate in oppositedirections, a screw geared to said shafts and located transversely tosaid shafts, said screw having two oppositely directed screw threads, areciprocating member, a guide guiding said reciprocating member to move1n a rectilineark path parallel to the axis of said screw, two sleevesjournalled in said reciprocating member, each sleeve having an interiorscrew thread engaging one of said screw threads on said screw, eachsleeve having an exterior screw thread, and one screw wheel secured toeach of said shafts and engaging such exterior thread on one of saidsleeves.

OTTO GOTTFRIED WELLTON.

